{% load my_tags %}
{% get_categories as categories %}
<nav class="navbar navbar-inverse">
  <div class="container-fluid">
    <!-- Brand and toggle get grouped for better mobile display -->
    <div class="navbar-header">
      <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="#">Brand</a>
    </div>

    <!-- Collect the nav links, forms, and other content for toggling -->
    <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
      <ul class="nav navbar-nav">
        <li class="active"><a href="{% url 'main:index' %}">首页 <span class="sr-only">(current)</span></a></li>
        {% for c in categories %}
            {% if c.children|length == 0 %}
          <li><a href="#">{{ c.title }}</a></li>
            {% else %}
             <li class="dropdown">
              <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">{{ c.title }} <span class="caret"></span></a>
              <ul class="dropdown-menu">
              {% for c2 in c.children %}
                <li><a href="{% url 'main:index' %}?category={{ c2.id }}">{{ c2.title }}</a></li>
              {% endfor %}

              </ul>
             </li>
            {% endif %}
        {% endfor %}

          </ul>

                # 此处必须为get方法  且查询name必须为q
                <form method='get' action="/search/" target="_blank">
                <input type="text" name="q">
                <input type="submit" value="查询">
                </form>
        <ul class="nav navbar-nav navbar-right">

          {% if request.user.is_authenticated %}
               <li><a href="{% url 'user:article_create' %}">写文章</a></li>
          <li class="dropdown">
              <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">{{ request.user.username }} <span class="caret"></span></a>
              <ul class="dropdown-menu">
                <li><a href="{% url 'user:center' %}">个人中心</a></li>
                <li><a href="{% url 'user:change_password' %}">修改密码</a></li>
                  <li><a href="{% url 'user:article_manage' %}">文章管理</a></li>

                <li role="separator" class="divider"></li>
                <li><a href="{% url 'user:logout' %}">退出</a></li>
              </ul>
          </li>
          {% else %}
          <li><a href="{% url 'user:login' %}">登录</a></li>
          <li><a href="{% url 'user:register' %}">注册</a></li>
          {% endif %}


      </ul>
    </div><!-- /.navbar-collapse -->
  </div><!-- /.container-fluid -->
</nav>